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Soil Sampling Work Plan Stockton,CA-SJRRC Property Exchange C�) Assessor's Parcel Number 117-09-014 a ntea g ro u p Antea Group Project No. UPR8281A 2.0 PROPOSED SCOPE OF WORK Antea Group proposes to advance 20 soil borings to a depth of five (5) feet below ground surface (bgs) for the collection of soil samples.The locations for the hand auger borings are shown on Figure 2. In the northern portion of the property, borings HA-3 and HA-5 are situated to evaluate conditions near the former teepee incinerator. Borings in the southern portion of the property (HA-17 through HA-20) are tightly clustered due to previous focused investigation in this area, including numerous groundwater samples exceeding RBRGs, and the lack of available soil data(AMEC 2009). Remaining borings are situated to provide comprehensive data on the remainder of the site to assess current conditions as well as potential railroad worker exposure within the proposed property transfer area. 2.1 Pre Field Activities Prior to initiating field activities, Antea Group will prepare a Health and Safety Plan (HASP) in accordance with Title 8, Section 5192 of the California Code of Regulations. The HASP will contain a list of emergency contacts, as well as a map showing the route to the nearest emergency facility, and will be reviewed daily by field personnel. Antea Group will open an Underground Service Alert ticket and contact railroad specific utility locator services at least 48 hours prior to ground disturbance in order to locate all utilities beneath the work locations. Antea Group will obtain permits for soil borings,and will make all required notifications prior to commencing field work. 2.2 Soil Borings Soil borings will be advanced to a maximum of five feet using a hand auger operated by a licensed C-57 drilling contractor. Down-hole tools will be decontaminated between each boring by using a non-phosphate detergent and water wash,water rinse, initial deionized/distilled water rinse and final deionized/distilled water rinse, per the DTSC-approved Soil Management Plan,further discussed below in Section 2.4. Upon completion of each hand auger location,bores will be backfilled to grade with Portland cement. 2.3 Soil Sampling Surface soil samples from 0-0.5 feet bgs will be collected since railroad workers will have greatest exposure to surface soils, and surface soils are expected to contain the greatest concentrations of CDCs. Deeper soil samples from 4.5-5 feet bgs will also be analyzed in order to determine railroad worker exposure during trenching or digging onsite. Soil will be classified using the Unified Soil Classification System and logged onto soil boring logs. Soil from each boring will be field-screened using a Photoionization detector (PID). These readings will be 3 www.anteagroup.com